Large diameter solar vacuum tubeSolar vacuum tube is the core parts
of solar oven and solar water heater. It absorbs solar energy
converting it into heat for solar cooking and hot water. Solar
vacuum tubes have already been used more than 20 years in
China. Each solar evacuated tube consists of two glass tubes
made from extremely strong borosilicate glass. The outer tube is
transparent allowing light rays to pass through with minimal
reflection. The inner tube is coated with a special selective
coating which features excellent solar radiation absorption and
minimal reflection properties. The top of the two tubes are fused
together and the air contained in the space between the two layers
of glass is pumped out while exposing the tube to high
temperatures. This "evacuation" of the gasses forms a vacuum, which
is an important factor in the performance of the evacuated
tubes.Why a vacuum? As you would know if you have used a glass
lined thermos flask, a vacuum is an excellent insulator. This is
important because once the evacuated tube absorbs the radiation
from the sun and converts it to heat, we don't want to lose it!!
The vacuum helps to achieve this. The insulation properties are so
good that while the inside of the tube may be 150oC / 304oF , the
outer tube is cold to touch. This means that evacuated tube water
heaters can perform well even in cold weather when flat plate
collectors perform poorly due to heat loss Specification:For
more infomation, please feel free to contact us ! /*
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